Kate sees a horrific attack streamed live on her laptop, she calls the police in a state of shock. But when they arrive, the video has disappeared - and she can't prove anything. Desperate to be believed, Kate tries to find out who the girl in the video could be - and who attacked her. Freddie and Nas are working on a missing persons case, but the trail has gone cold. When Kate contacts them, they are the only ones to listen and they start to wonder - are the two cases connected?